Messengers of Disaster draws upon little-known texts from an array of archives, including the International Committee of the Red Cross in Geneva and the International Tracing Service in Bad Arolsen. Carrying the knowledge of disaster took a toll on Lemkin and Karski, but their work prepared the way for the United Nations to unanimously adopt the first human rights convention in 1948 and influenced the language we use to talk about genocide today. Annette Becker's detailed study of these two important figures illuminates how distortions of fact can lead people to deny knowledge of what is happening in front of their own eyes.